CN202750321U - Filament preheating circuit module provided with negative temperature coefficient thermistors - Google Patents
Filament preheating circuit module provided with negative temperature coefficient thermistors Download PDFInfo
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- CN202750321U CN202750321U CN 201220457190 CN201220457190U CN202750321U CN 202750321 U CN202750321 U CN 202750321U CN 201220457190 CN201220457190 CN 201220457190 CN 201220457190 U CN201220457190 U CN 201220457190U CN 202750321 U CN202750321 U CN 202750321U
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- temperature coefficient
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Abstract
The utility model belongs to the technical field of lighting, which relates to a filament preheating circuit module, and particularly relates to a filament preheating circuit module provided with negative temperature coefficient thermistors. The filament preheating circuit module comprises an electronic ballast, a delay switch, a bidirectional transient voltage suppressor diode, a first negative temperature coefficient thermistor NTC1, a second negative temperature coefficient thermistor NTC2 and a lamp tube, wherein the first negative temperature coefficient thermistor NTC1 and the second negative temperature coefficient thermistor NTC2 are connected with a first filament and a second filament in parallel respectively. The utility model provides a filament preheating circuit module which adopts the negative temperature coefficient (NTC) thermistors, which are connected to both ends of the filaments in parallel respectively, as a core component of preheating, can ensure preheat current to be large enough when the lamp tube is turned on and current of the filaments to be small enough when the lamp tube works normally, and does not impact a resonance circuit of the ballast at the same time.
Description
Technical field
The utility model belongs to lighting technical field, relates to a kind of filament preheating circuit module, especially a kind of filament preheating circuit module with negative tempperature coefficient thermistor.
Background technology
Traditional filament preheating circuit all adopts the thermistor PTC of positive temperature coefficient to be connected in parallel in the LC resonant circuit.Utilize the resonance current in the characteristic shunting LC resonant circuit of PTC, make resonant circuit Q value step-down, the resonance potential step-down makes the voltage of lamp tube ends not reach the starting resistor of lamp.Treating that the tube cathode preheating is finished when reaching the optimum transmit electronic state starts fluorescent tube, plays like this effect of preheating.Yet when circuit normally after the startup work, because PTC can't block the shunting to resonant circuit fully, so that circuit PTC when normal operation is in the thermodynamic equilibrium state all the time.The height of PTC body temperature affects the size by electric current, has influence on again the variation of PTC body temperature by the size of electric current.Specifically, when PTC presented high-impedance state, electric current reduced, and PTC body temperature decreases, and resistance just reduces, and this electric current that causes again flowing through PTC increases, and so circulation is among the variable condition PTC all the time.This state exists harm, be exactly behind fluorescent lamp lighting, filament loop can be because of the existence of PTC, all the time there is electric current to pass through filament, form therefrom emission current, accelerated the aging of filament, the fluorescent tube of cap part can very fast blackout, have a strong impact on the luminous efficiency of fluorescent tube, shortened the useful life of fluorescent tube.And, when PTC is parallel to lamp tube ends, bear larger open circuit voltage (being generally about 1000V), at this moment the temperature of PTC resistance curve is after being higher than switch temperature, it is slow to rise, in addition, and when high-frequency current process PTC, it is slow that its temperature resistance characteristic curve is risen after being higher than switch temperature, and these all can make PTC to the preheating degradation of filament.
Therefore be necessary to develop a kind of novel filament preheating circuit module, make its thermistor NTC that adopts negative temperature coefficient as the preheating core component, form with load is connected in parallel on the tube filament two ends, can guarantee that the preheat curent when fluorescent tube starts is enough large, and the electric current on the filament is enough little after the normal operation, can not exert an influence to the ballast resonant circuit simultaneously, and the power consumption of preheat circuit is very little.
Summary of the invention
The utility model is for the problem of prior art, provide a kind of thermistor NTC of negative temperature coefficient that adopts as the preheating core component, form with load is connected in parallel on the tube filament two ends, can guarantee that the preheat curent when fluorescent tube starts is enough large, and the electric current on the filament is enough little after the normal operation, simultaneously can be to the filament preheating circuit module that the ballast resonant circuit exerts an influence and power consumption is very little.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
Described a kind of filament preheating circuit module with negative tempperature coefficient thermistor comprises electric ballast, delay switch, bilateral transient voltage suppression diode, the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 and fluorescent tube; Described the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 respectively with the first filament, the second filament parallel.
Further, described electric ballast comprises rectification circuit, the first electric capacity and the second electric capacity; The two ends of described the first electric capacity are connected with the output of described rectification circuit respectively, after described delay switch is connected with described bilateral transient voltage suppression diode and described the second Capacitance parallel connection and jointly being connected between described the first filament and the second filament, the other two ends of filament respectively with described the first Capacitance parallel connection.
Further, described electric ballast also comprises the first diode and the second diode, described the first diode be connected the negative pole of diode and be connected with the two ends of the first electric capacity respectively, anodally be connected with the two ends of the second electric capacity respectively.
Further, the normal temperature resistance of described the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 is respectively greater than the first filament, the second filament normal temperature resistance 4 times.
A kind of operation principle with filament preheating circuit module of negative tempperature coefficient thermistor described in the utility model is: the high pressure conducting that utilizing connects with the delay switch of the second Capacitance parallel connection and bilateral transient voltage suppression diode produces and the characteristic of the disconnection of delaying time provides preheating for tube filament, thereby avoided the filament cold conditions to start by force fluorescent tube and caused lamp tube ends blackout, in advance old and feeble problem.On the other hand, use the thermistor NTC of negative temperature coefficient in parallel with tube filament, in the filament pre-heating process, hinder characteristic according to the temperature of the thermistor NTC of negative temperature coefficient, the initial resistance of the thermistor NTC of negative temperature coefficient is very large, and is very little to the shunting of filament.The electric current that flows through like this filament will be very large, accelerated the preheating of tube cathode, makes negative electrode normal transmission electronics.Thereby reduced the fluorescent tube starting resistor, improved the electric stress that the ballast electronic devices and components bear.After fluorescent tube normal operation the thermistor NTC of negative temperature coefficient also Yin Wendu rising and resistance diminishes, strengthened the shunting to filament, make tube cathode be in the temperature of normal transmission electronics, prolong the useful life of whole lamp.
The utility model has the advantage of: a kind of filament preheating circuit module with negative tempperature coefficient thermistor is provided, adopt the thermistor NTC of negative temperature coefficient as the preheating core component, form with load is connected in parallel on the tube filament two ends, can guarantee that the preheat curent when fluorescent tube starts is enough large, and the electric current on the filament is enough little after the normal operation, simultaneously not can to the ballast resonant circuit exert an influence and power consumption very little, it is low to have cost, use safety, reliably, can guarantee the normal startup of fluorescent tube and work, it is aging effectively to reduce filament, the useful life of prolonging lamp tube.In addition, because delay switch and bilateral transient voltage suppression diode inactivity consume, this also greatly reduces the energy consumption of fluorescent tube, improves system effectiveness, realizes energy-efficient.
Description of drawings
Fig. 1 is a kind of circuit theory diagrams with filament preheating circuit module of negative tempperature coefficient thermistor described in the utility model.
The division mark is as follows in the accompanying drawing: 101, electric ballast; 102, rectification circuit; 121, input; 122, output; 103, the first electric capacity; 104, the first diode; 105, the second diode; 110, the second electric capacity; 111, delay switch; 112, bidirectional transient voltage resists diode; 107, fluorescent tube; 108, the first filament; 109, the second filament.
Embodiment
As shown in Figure 1, a kind of circuit theory diagrams with filament preheating circuit module of negative tempperature coefficient thermistor comprise electric ballast 101, delay switch 111, bilateral transient voltage suppression diode 112, the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 and fluorescent tube 107; Described the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 are in parallel with the first filament 108, the second filament 109 respectively.Described electric ballast 101 comprises rectification circuit 102, the first electric capacity 103, the second electric capacity 110, the first diode 104 and the second diode 105; The two ends of described the first electric capacity 103 are connected with the output of described rectification circuit 102 respectively, it is in parallel with described the second electric capacity 110 after described delay switch 111 is connected with described bilateral transient voltage suppression diode 112, jointly be connected on after the parallel connection between described the first filament 108 and the second filament 109, the other two ends of filament are in parallel with described the first electric capacity 103 respectively.Described the first diode 104 be connected the negative pole of diode 105 and be connected with the two ends of the first electric capacity 103 respectively, anodally be connected with the two ends of the second electric capacity 110 respectively.
When selecting the normal temperature resistance of negative tempperature coefficient thermistor NTC, should determine according to matching used tube filament resistance, generally should be greater than more than 4-5 times of tube filament cold-state resistance.Guarantee fluorescent tube filament when starting has enough large preheat curent like this.And the temperature coefficient of the negative tempperature coefficient thermistor NTC that selects should be large as far as possible, and the metapyretic resistance of guarantee negative tempperature coefficient thermistor NTC overcurrent is enough little like this, reaches better the purpose that reduces heater current.
Obviously above-described embodiment is not to restriction of the present utility model, and above-mentioned a kind of filament preheating circuit module with negative tempperature coefficient thermistor can also have other many variations.Although discussed the utility model in detail in conjunction with above-mentioned example, some that should be understood that professional person in the industry can expect apparently are identical, and alternative scheme all falls within the protection range that the utility model claim limits.
Claims (4)
1. filament preheating circuit module with negative tempperature coefficient thermistor, it is characterized in that, comprise electric ballast (101), delay switch (111), bilateral transient voltage suppression diode (112), the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 and fluorescent tube (107); Described the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 are in parallel with the first filament (108), the second filament (109) respectively.
2. the filament preheating circuit module with negative tempperature coefficient thermistor according to claim 1 is characterized in that, described electric ballast (101) comprises rectification circuit (102), the first electric capacity (103) and the second electric capacity (110); The two ends of described the first electric capacity (103) are connected with the output of described rectification circuit (102) respectively, described delay switch (111) is in parallel with described the second electric capacity (110) and jointly be connected between described the first filament (108) and the second filament (109) after connecting with described bilateral transient voltage suppression diode (112), and the other two ends of filament are in parallel with described the first electric capacity (103) respectively.
3. the filament preheating circuit module with negative tempperature coefficient thermistor according to claim 1, it is characterized in that, described electric ballast (101) also comprises the first diode (104) and the second diode (105), described the first diode (104) be connected the negative pole of diode (105) and be connected with the two ends of the first electric capacity (103) respectively, positive pole is connected with the two ends of the second electric capacity (110) respectively.
4. the filament preheating circuit module with negative tempperature coefficient thermistor according to claim 1, it is characterized in that the normal temperature resistance of described the first negative tempperature coefficient thermistor NTC1, the second negative tempperature coefficient thermistor NTC2 is respectively greater than the first filament (108), the second filament (109) normal temperature resistance 4 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220457190 CN202750321U (en) | 2012-09-07 | 2012-09-07 | Filament preheating circuit module provided with negative temperature coefficient thermistors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220457190 CN202750321U (en) | 2012-09-07 | 2012-09-07 | Filament preheating circuit module provided with negative temperature coefficient thermistors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202750321U true CN202750321U (en) | 2013-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220457190 Expired - Fee Related CN202750321U (en) | 2012-09-07 | 2012-09-07 | Filament preheating circuit module provided with negative temperature coefficient thermistors |
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| Country | Link |
|---|---|
| CN (1) | CN202750321U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109938635A (en) * | 2017-12-21 | 2019-06-28 | 青岛经济技术开发区海尔热水器有限公司 | Water mixer, shower and control method thereof |
-
2012
- 2012-09-07 CN CN 201220457190 patent/CN202750321U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109938635A (en) * | 2017-12-21 | 2019-06-28 | 青岛经济技术开发区海尔热水器有限公司 | Water mixer, shower and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20150907 |
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| EXPY | Termination of patent right or utility model |